Calculate occurrence dates from EKRecurrenceRule

Given an EKRecurrenceRule, a start date and a range of dates, how to get a list of occurrence dates that fall within that range?

Here’s a general approach:

Step-by-step (in Swift):

1. Create an EKEvent with a recurrence rule.


2. Use EKEventStore to fetch events in a date range, which will include the recurring ones.



Example in Swift:

import EventKit

let store = EKEventStore()
store.requestAccess(to: .event) { (granted, error) in
    if granted {
        let calendars = store.calendars(for: .event)
        let startDate = Date()
        let endDate = Calendar.current.date(byAdding: .year, value: 1, to: startDate)!

        let predicate = store.predicateForEvents(withStart: startDate, end: endDate, calendars: calendars)

        let events = store.events(matching: predicate)
        
        let recurringEvents = events.filter { $0.recurrenceRules != nil }
        
        for event in recurringEvents {
            print("Event: